2014

2014

This photo taken Wednesday, July 2, 2014, and released Monday, July 21, 2014, to mark Prince George's first birthday, shows Britain's Prince William and Kate Duchess of Cambridge and the Prince during a visit to the Sensational Butterflies exhibition at the Natural History Museum, London.

Credit: AP Photo/John Stillwell, Pool

2014

Kate, Duchess of Cambridge, holds Prince George of Cambridge as they visit the Bilby Enclosure at Taronga Zoo on April 20, 2014, in Sydney, Australia.

Credit: Getty Images

2013

Kate, Duchess of Cambridge, and Prince William, Duke of Cambridge, attend the Royal film performance of "Mandela: Long Walk to Freedom" at Odeon Leicester Square on Dec. 5, 2013, in London.

Credit: Chris Jackson - WPA Pool/Getty Images

2013

The Duke and Duchess of Cambridge with their son, Prince George, arrive at Chapel Royal in St James's Palace, for George's christening by the Archbishop of Canterbury in central London on Oct. 23, 2013.

Credit: Getty Images

2013

Prince William, Duke of Cambridge, and Kate, Duchess of Cambridge, depart The Lindo Wing with their newborn son, Prince George of Cambridge, at St Mary's Hospital on July 23, 2013, in London. The baby boy was born July 22.

Credit: Chris Jackson/Getty Images

2013

Kate, Duchess of Cambridge, stands on the balcony of Buckingham Palace during the annual Trooping the Colour Ceremony on June 15, 2013, in London.

Credit: Chris Jackson/Getty Images

2013

Prince William and Kate, Duchess of Cambridge, visit the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Credit: Chris Jackson/Getty Images

2012

Kate, Duchess of Cambridge, waves as she arrives at the Guildhall in Cambridge, England, on Nov. 28, 2012.

Credit: AP Photo/PA, Chris Radburn

2012

Prince William and Kate, Duchess of Cambridge, smile as they arrive at Honiara Cathedral during their Diamond Jubilee tour of the Far East on Sept. 16, 2012, in Honiara, Solomon Islands.

Credit: Chris Jackson/Getty Images

2012

Kate, Duchess of Cambridge, right, and her sister, Pippa Middleton, sit in the Royal Box during the Gentlemen's Singles final match between Roger Federer of Switzerland and Andy Murray of Great Britain during the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 8, 2012, in London.

Credit: Clive Brunskill/Getty Images

2012

Kate, Duchess of Cambridge and Queen Elizabeth II applaud as they listen to a welcome speech on March 8, 2012, in Leicester, England.

Credit: Matt Cardy/Getty Images

2011

Kate, Duchess of Cambridge, arrives to attend a Christmas Service at St. Mary's Church on the grounds of Queen Elizabeth II's Sandringham Estate in Norfolk, England, on Dec. 25, 2011.

2011

2011

Prince William, Duke of Cambridge, and Kate, Duchess of Cambridge, visit the Summerfield Community Centre, on August 19, 2011 in Birmingham, England.

Credit: Getty Images

2011

Kate, Duchess of Cambridge arrives at the BAFTA Brits to Watch event held at the Belasco Theatre on July 9, 2011, in Los Angeles.

Credit: Kevork Djansezian/Getty Images

2011

Prince William hugs his wife Kate, Duchess of Cambridge, after competing against her team in a dragon boat race at Dalvay-by-the-Sea on Prince Edward Island as part of their royal tour of Canada, Monday, July 4, 2011.

Credit: AP Photo/Robert F. Bukaty

2011

Britain's Prince William and his bride Kate, Duchess of Cambridge, leave Westminster Abbey, London, following their wedding, Friday April 29, 2011.

Credit: AP Photo/Tom Hevezi

2011

Catherine Middleton waves to the crowds as her sister and Maid of Honor Pippa Middleton holds her dress before walking in to the Abbey to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding.

Credit: GETTY

2011

Kate Middleton waves and smiles to the cheering crowds as she arrives at the Goring Hotel in London, on April 28, 2011. Middleton is staying at the 5-star hotel with her family ahead of her wedding to Britain's Prince William on April 29 at Westminster Abbey.

Credit: Jeff J Mitchell/Getty Images

2011

Britain's Prince William watches, as Kate Middleton flips a pancake at a display by the charity Northern Ireland Cancer Fund for Children, outside the City Hall in Belfast, Northern Ireland, Tuesday, March 8, 2011.

Credit: AP Photo/Peter Morrison

2010

Britain's Prince William and his fiancee, Kate Middleton, pose for photographers during a photocall to mark their engagement, in the State Rooms of St James's Palace, central London, on Nov. 16, 2010.

2010

Prince William and Kate Middleton leave the wedding of their friends Harry Mead and Rosie Bradford in the village of Northleach, England, on Oct. 23, 2010.

Credit: AP Photo/Chris Ison/PA

2009

Kate Middleton arrives at a charity disco in London on Sept. 17, 2009.

Credit: AP Photo/David Davies/PA

2008

Kate Middleton attends the 46664 Concert in Celebration of Nelson Mandela's Life held at Hyde Park on June 27, 2008, in London.

Credit: Gareth Cattermole/Getty Images

2008

Prince William's girlfriend Kate Middleton attends day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 28, 2008, in London.

Credit: Ryan Pierse/Getty Images

2008

Britain's Prince William and girlfriend Kate Middleton are photographed at RAF Cranwell, England, on April 11, 2008, after William received his RAF wings from his father, the Prince of Wales.

Credit: AP Photo/Michael Dunlea/Pool

2008

Kate Middleton watches the David Nicholson Mares Hurdle on day four of the Cheltenham festival at Cheltenham Racecourse on March 14, 2008, in Cheltenham, England.

Credit: Phil Cole/Getty Images

2007

Kate Middleton, the girlfriend of Prince William, looks on from the Royal Box on the fourth day of The Annual National Hunt Festival held at Cheltenham Racecourse on March 16, 2007, in Cheltenham, England.

Credit: Ryan Pierse/Getty Images

2007

An unditenfitied man speaks with Britain's Prince William and Kate Middleton n the paddock enclosure on the first day of the annual Cheltenham Race Festival at Cheltenham Race course, west of England, March 13, 2007.

2006

2005

Kate Middleton, girlfriend of Prince William, watches the events in the main arena on the second day of the Gatcombe Park Festival of British Eventing at Gatcombe Park, on Aug. 6, 2005, near Tetbury, England.

Credit: Matt Cardy/Getty Images

2005

Kate Middleton leaves Younger Hall after her graduation ceremony on June 23, 2005, in St. Andrews, Scotland.